Indicator device



Oct 27, ,1936- T. sLoczEwsKl l 2,058,641y

INDICATOR DEVICE Filed July l6, 1935 ATTORNEY Patented oci. 27, 1936 i 2,058,641

UNITED STATES PATENT OFFICE INDICATOR DEVICE Thaddeus Slonczewski, New York, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application July 6, 1935, Serial No. 30,198 4 claims. (o1. iis-124.1)

This invention relates to radio apparatus, and 29, 2| and 22, which are secured to the supmore specifically to a device for use in such apporting plate Ill by a number of ordinary screws paratus for indicating the adjusted position of such as SC shown in Fig. 2. the tuning elements. y On the other end of shaft I9 opposite to that According to the indicator device of the inof pinion I8 is mounted a worm 23 eng-aging with vention, a film is provided with a continuous row a worm wheel 24 securely mounted on the rotor of striations in spaced relation which correspond shaft 25 of a condenser device CD for adjustto predetermined adjustment of the radio tuning it upon the movement of a crank I6 within ing elements. Means in the form of a sprocket the angular distance determined by the stop wheel operating upon the adjustment of such lugs V26 and 2'I formed with the bracket II when elements is provided, whereby the film is moved engaged by the stop lug 28 carried by the worm in front of an opening in the panel of the mountgear I5. ing of the set with one of its ends winding on a The adjusting movement of condenser elespool, while the other end unwinds from anment CD is indicated by a lm 29 having perother spool through the operation of a gearing forations PF along its longitudinal edges for mechanism having resilient means provided for engaging the teeth of a sprocket wheel W seoperatively connecting the two spools in a mancurely mounted on the'shaft I9. One end of ner that the film is held under tension irrespecthe film passes on an idler roller 5I and is setive of the direction of the movement of the cured to a spool 30 keyed on a spindle 34 and tuning elements. The use of a ilm together the other end of the film from the sprocket with its operating mechanism makes it possible wheel W passes on the idler roller 59 and this tcobtain a scale divided into fractions of a kiloend of the lm engages a slot SL in the spool 3l cycle in less space than that occupied by an ordishown in enlarged view in Fig. 3. Spool 3l nary disc or drum and effects greater accuracy is loosely mounted on a spindle 35 but is opin the setting of the tuning elements, eratively connected thereto through a spiral 2 Other features of the invention will appear spring 4D having one end secured to spindle 35 from the following description and by the claims by a pin 4I shown in Fig. 1 and its outer end appended thereto, reference being had to the to a slotted collar 42 in turn secured to the spool accompanying drawing in which: 3| by a number of screws such as 44. The spin- Fig. l is a side elevation view shown with a dles 34 and 35 of spools 39 and 3l are journaled number of operating parts with portions cut in brackets 36 and 3l secured to the mounting away; plate I0 by screws SCI shown in Figs. 1 and 2 Fig. 2 is a top assembly View; and are operatively connected to each other by Fig. 3 is an enlarged view of one of the spools gears 32 and 33. with portions out away; and In the rear side of plate l0 there is securely Fig. 4 is a front View of a portion of the film mounted a bracket 45 provided for supporting a with the sc-ale printed thereon. reiiector 46 provided with a lamp 41 and a me- As shown in Figs. 1 and 2 of the drawing, I9 tallic strip 48 disposed to cast its shadow on is a supporting plate for mounting a bracket the illuminated portion of the film when pass- 40 II having a bearing portion I2 cooperating with ing in front of the opening 49 in the plate I. a bearing portion in the plate I9 for rotatably The film 29, as shown in Fig. 4, is graduated in supporting a shaft I3. This shaft is formed with kilocycles and fractions thereof which permits a Worm portion I4 engaging a worm wheel I5 very close adjustment of the condenser CD or for rotating it 0n a pVOt P 111.0011 the Operation any other apparatus in which the indicator of of a crank I6 secured to the front end of shaft this invention may be used due to the great I3, the worm wheel I5 having a lug 28 laterally length of film used in relation to the angular adeXtendin-g from one of its sides for engaging justing movement of the condenser. with stop lugs 26 and 2l formed with the brack- In a typical example of operation, one end of et II upon the movement of worm wheel I5 for the film 29 is coiled a maximum number of turns a purpose that will be hereinafter described in on the spool 3|, for example, when the rotor eledetail. ment of condenser CD is fully engaged with its On shaft I3 is securely mounted an angular associated stator element and the stop 28 abutgear II disposed in engaged relation with anting .against the lug 21, the other end of the lm other angular gear I8 secured on one end of a being secured and coiled a few turns on the spool shaft I9. This shaft is journaled in brackets 30.

Under this condition the operation of crank I6 is effective to actuate the rotor shaft and to move the sprocket Wheel W in a clockwise direction for moving the film 29 on the front of the light projector 46 where it may be visually observed from the opening 49 in the plate l0. The operation of the film 29 and the consequent rotating movement of spool 3| is effective to rotate its supporting spindle 35 through the tension of spiral spring 4l) and the operation of spindle 35 is imparted to the spool 30 through the gears 33 and 32 for taking up the slack on the other end of the film to a point wherein the stop 28 engages with lug 26, thus preventing excessive tension or stress on the film. Similarly, upon a movement of the sprocket Wheel W in a counterclockwise direction is effective to rotate the spool 32 in the direction indicated by the arrow in Fig. l and thereby rotating the gear 33 and `the spindle 35 for permitting the unwinding of the spiral spring and the consequent rotation of the spool 3i for taking up the slack of the film at this end. In the indicator of the invention a comparative great length of lm is used for a 180 degree adjustment of condenser CD and this permits the graduation of such a film in hundredths of a kilocycle or in other value when used inY connection with other measuring apparatus.

It is understood that many changes may be made in this indicating device without departing from the spirit of the invention and the scope of v the appended claims.

What is claimed is:

1. In a device for indicating the adjusted position of tuning elements in a radio set having a rotatable shaft, a sprocket Wheel carried by said shaft, a film operatively engaging said sprocket wheel, a pair of spools for winding and unwinding the film according to the direction of the tuning elements, a row of striations on said film for indicating the adjusted position of the elements and a rotating member operating conjointly with said shaft and having means engaging with stationary means for limiting the extent of turning movement of the rotatable shaft and said film in each direction.

2. In a device for indicating the adjusted position of the tuning elements in a radio apparatus having a rotatable shaft, said device comprising a film, a sprocket wheel, a shaft for said sprocket wheel operatively connected to the firstmentioned shaft, a pair of spool members, a pair of spindles for supporting said spool members, said film having its ends secured to said spool members and operatively engaging said wheel, one of said spool members being secured to its supporting spindle and the other spindle rotatable independently of its spool member, spring means operatively connecting the last-mentioned spool to said spindle for permitting movement of said members relative to each other upon the movement of said film. a plurality of stationary stopping elements, a rotatable gear and a stopping element carried by said rotatable gear and f disposed in the path of said stationary elements for limiting the movement of the rotatable shaft and said film.

3. In a device for indicating the adjusted position of tuning elements in a radio apparatusy said device comprising a iilm, a shaft, a sprocket wheel carried by said shaft for actuating said film, a pair of parallelly disposed spindles, a spool and a gear securely mounted on one of said spindles, a gear secured on the other of said spindles, a spool loosely mounted on the lastmentioned spindle and engaging the other gear, means in each of said spools for securing the ends of said film, yieldable means operatively connecting the last-mentioned spindle to the lastmentioned spool for permitting relative movement between each of said spools upon the operation of said film, a light projector and a pointer cooperating with said film for indicating the adjustment of said elements.

4. In a device for indicating the adjusted position of tuning elements in a radio set having an adjustable member, said device comprising a pair of spools, a film having its ends Wound on said spools, a gearing mechanism operatively connecting said spools, a sprocket wheel operable for Winding and unwinding said film on said spools according to the directionv of movement of the adjusable member, means carried by said film for indicating the movement of the adjustable member, a second gearing mechanism for rotating said sprocket wheel, and a plurality of cooperating stopping means actuated by said second mechanism for determining the extent of movement of said film.

` THADDEUS SLONCZEWSKI. 

